XML 형식에 따른 규약? 규약에 대한 XML 형식? <rng:element name="datatype "> <rng:ref name="att.global.attributes  <rng:optional> <rng:attribute name="minOccurs " a:defaultValue="1 "> <rng:ref name="data.count  </rng:attribute> </rng:optional> <rng:optional> <rng:attribute name="maxOccurs " a:defaultValue="1 "> <rng:choice> <rng:ref name="data.count  <rng:value> unbounded</rng:value> </rng:choice> </rng:attribute> </rng:optional> <rng:zeroOrMore> <rng:group> <rng:ref name="macro.schemaPattern  </rng:group> </rng:zeroOrMore> </rng:element> 
element  datatype 
{
   att.global.attributes ,
   attribute minOccurs { data.count  }?,
   attribute maxOccurs { data.count  | "unbounded" }?,
   macro.schemaPattern *
}